Real-Time Outlier Detection with Dynamic Process Limits
This work addresses the need for low-latency, adaptable anomaly detection in systems like microgrids, where rare events can impact profitability and safety, though it appears incremental as it builds on existing online detection concepts.
The paper tackled the problem of deploying anomaly detection methods in real-time infrastructures where data drifts and novel patterns occur unpredictably, by proposing an online inverse cumulative distribution-based approach that provides dynamic process limits, resulting in ease of use, fast computation, and deployability as demonstrated in two case studies with real microgrid operation data.
Anomaly detection methods are part of the systems where rare events may endanger an operation's profitability, safety, and environmental aspects. Although many state-of-the-art anomaly detection methods were developed to date, their deployment is limited to the operation conditions present during the model training. Online anomaly detection brings the capability to adapt to data drifts and change points that may not be represented during model development resulting in prolonged service life. This paper proposes an online anomaly detection algorithm for existing real-time infrastructures where low-latency detection is required and novel patterns in data occur unpredictably. The online inverse cumulative distribution-based approach is introduced to eliminate common problems of offline anomaly detectors, meanwhile providing dynamic process limits to normal operation. The benefit of the proposed method is the ease of use, fast computation, and deployability as shown in two case studies of real microgrid operation data.